Sumire goodbye was in episode 103, at which time Boruto and Sumire tried to stop Jugo and Tosaka.
If observed, Jugo figure is like figure of Pain Nagato, and of course reminds him of time when Naruto fought Pain where Hinata tried to help Naruto.
Boruto himself is a ninja who is smart and genius, where in that era there was a world of technology and progress.
Now in episode Boruto: Naruto Next Generations Scientific ninja tools are needed and can be useful for many people. So that based on analysis of Sumire will, it could be possible to return to ninja world and determine Boruto through her knowledge and then they both got married.
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